I had this problem, too. journalctl -b|grep glamor showed this: /usr/lib/gdm3/gdm-x-session[2205]: (EE) modeset(0): glamor initialization failed
which is why gnome-shell was falling back to llvmpipe. However, there was some funny business going on with my libGL installation, because ldd /usr/bin/glxinfo showed: libGL.so.1 => /usr/local/lib/libGL.so.1 (0x00007fe67e633000) libGLX.so.0 => /usr/local/lib/libGLX.so.0 (0x00007fe67dccd000) libGLdispatch.so.0 => /usr/local/lib/libGLdispatch.so.0 (0x00007fe67da16000) meaning I must have manually built and installed versions of libGL/X at some point. I deleted the libGL/X libraries and the xorg folder from /usr/local/lib and after a reboot I now have intel mesa graphics again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1752938 Title: Upgrading Ubuntu 18.04 disables GPU hardware acceleration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1752938/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs